I copied this from the AABB website. I hope it helps.
Billing for Blood and Transfusion Services: Frequently Asked Questions and Answers
Question: Can you charge for Sickle Cell testing on units for Sickle Cell patients and if you are protecting a patient from other antigens, which may stimulate them to produce even more antibodies, can you charge antigen typings for those units? For example a sickle positive patient who needs products which are sickle negative and E negative due to the patient having Anti-E but we also give K and S negative in order to protect patient in accordance with their phenotype.
Answer: Yes, you may bill for any service performed on a blood component for a patient if it is medically reasonable and necessary. The sickle cell patient protocol is now standard practice to start all new patients (and older patients that are antibody formers) with C, E, K neg (some facilities also do Fya as appropriate). This should be stated in your Transfusion Services policy (SOP) on Hb SX patients. In these cases, you would code CPT 85660 per unit screened and 86905 per antigen/per unit typed. Revenue code is 030X for both.
Reference: AMA 2007 CPT